Harbour porpoises exposed to PCBs had shrunken testicles, suggesting sperm and fertility effects.

Nearly every country will see their populations fall as the world has fewer babies.

A new approach could preserve fertility for boys having cancer treatment - thanks to a baby monkey.

The philosopher Baroness Mary Warnock has died at the age of 94.

The boy and girl are identical on their mother's side but share only a proportion of their father's DNA.

"My experience at school would be very different now," says Alice Smith, who suffers with endometriosis.

From reversing blindness and paralysis to new treatments for cancer and infertility.

A study of beetles could explain global decline in insects - and how heat can damage male fertility.